ABAP Select data from SAP table MSSDBLOCKS into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP MSSDBLOCKS table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to MSSDBLOCKS. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the MSSDBLOCKS table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_MSSDBLOCKS TYPE STANDARD TABLE OF MSSDBLOCKS,
      WA_MSSDBLOCKS TYPE MSSDBLOCKS,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <MSSDBLOCKS> TYPE MSSDBLOCKS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MSSDBLOCKS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MSSDBLOCKS
  INTO TABLE IT_MSSDBLOCKS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSSDBLOCKS
*  INTO TABLE @DATA(IT_MSSDBLOCKS2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_MSSDBLOCKS INDEX 1 INTO DATA(WA_MSSDBLOCKS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MSSDBLOCKS ASSIGNING <MSSDBLOCKS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSSDBLOCKS>-ACTFLAG = 1.
<MSSDBLOCKS>-FIRSTOCCUR = 1.
<MSSDBLOCKS>-REQSPID = 1.
<MSSDBLOCKS>-HOLDSPID = 1.
<MSSDBLOCKS>-REQPID = 1.

ENDLOOP.

LOOP AT IT_MSSDBLOCKS INTO WA_MSSDBLOCKS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSSDBLOCKS-OPEN_TRAN, sy-vline,
  WA_MSSDBLOCKS-PROCSTAT, sy-vline,
  WA_MSSDBLOCKS-USERNAME, sy-vline,
  WA_MSSDBLOCKS-HOSTNAME, sy-vline,
  WA_MSSDBLOCKS-PROGNAME, sy-vline,
  WA_MSSDBLOCKS-COMMAND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSSDBLOCKS you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_MSSDBLOCKS TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_MSSDBLOCKS INTO WA_MSSDBLOCKS.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MSSDBLOCKS_STR, 
ACTFLAG TYPE STRING,
FIRSTOCCUR TYPE STRING,
REQSPID TYPE STRING,
HOLDSPID TYPE STRING,
REQPID TYPE STRING,
OPEN_TRAN TYPE STRING,
PROCSTAT TYPE STRING,
USERNAME TYPE STRING,
HOSTNAME TYPE STRING,
PROGNAME TYPE STRING,
COMMAND TYPE STRING,
INPUTBUFF TYPE STRING,
WAITTIME TYPE STRING,
WAITRSC TYPE STRING,
LASTWTYPE TYPE STRING,
DBNAME TYPE STRING,
OBJNAME TYPE STRING,
INDEXNAME TYPE STRING,
LOCKRSC TYPE STRING,
LOCKTYPE TYPE STRING,
LOCKNAME TYPE STRING,
LOCKSTAT TYPE STRING,
REQ_REFCNT TYPE STRING,
REQ_OWNERTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSSDBLOCKS_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_MSSDBLOCKS_STR-ACTFLAG sy-vline 
WA_MSSDBLOCKS_STR-FIRSTOCCUR sy-vline 
WA_MSSDBLOCKS_STR-REQSPID sy-vline 
WA_MSSDBLOCKS_STR-HOLDSPID sy-vline 
WA_MSSDBLOCKS_STR-REQPID sy-vline 
WA_MSSDBLOCKS_STR-OPEN_TRAN sy-vline 
WA_MSSDBLOCKS_STR-PROCSTAT sy-vline 
WA_MSSDBLOCKS_STR-USERNAME sy-vline 
WA_MSSDBLOCKS_STR-HOSTNAME sy-vline 
WA_MSSDBLOCKS_STR-PROGNAME sy-vline 
WA_MSSDBLOCKS_STR-COMMAND sy-vline 
WA_MSSDBLOCKS_STR-INPUTBUFF sy-vline 
WA_MSSDBLOCKS_STR-WAITTIME sy-vline 
WA_MSSDBLOCKS_STR-WAITRSC sy-vline 
WA_MSSDBLOCKS_STR-LASTWTYPE sy-vline 
WA_MSSDBLOCKS_STR-DBNAME sy-vline 
WA_MSSDBLOCKS_STR-OBJNAME sy-vline 
WA_MSSDBLOCKS_STR-INDEXNAME sy-vline 
WA_MSSDBLOCKS_STR-LOCKRSC sy-vline 
WA_MSSDBLOCKS_STR-LOCKTYPE sy-vline 
WA_MSSDBLOCKS_STR-LOCKNAME sy-vline 
WA_MSSDBLOCKS_STR-LOCKSTAT sy-vline 
WA_MSSDBLOCKS_STR-REQ_REFCNT sy-vline 
WA_MSSDBLOCKS_STR-REQ_OWNERTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.